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    <title>Document</title>
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<script>
    // "user=a123123&pwd=123123&phone=17386141517&email=123123@qq.com"
    //  解析为对象  {user,pwd,phone,email}

    // 1. 先用 & 拆分   => ['user=a123123', 'pwd=123123', 'phone=17386141517', 'email=123123@qq.com']
    // 2. 遍历数组, 在用等号拆


    var data = {
        user: "a123123",
        pwd: "123123",
        phone: "17386141517",
        email: "123123@qq.com",
    }

    var list = [];

    for (var key in data) {
        var val = data[key];
        list.push(`${key}=${val}`);
    }
    console.log(list);

    data = list.join("&");

    console.log(data);




</script>

</html>